If making people feel safer walking and biking in cities = "worthless shit" to you then why are you even here? I can't tell you how many times I've been honked at or yelled at or nearly run over while walking or on my bike by drivers who refuse to stop at red lights at all because of the right on red rule.
Cars don't belong in cities at all, with the possible exception of delivery/commercial vehicles and vehicles for disabled people. Banning right on red is just one part of a multi-pronged approach to get us there, together with better bicycle infrastructure and public transit, etc.
you know what else slows down ambulances? Congestion
I live near a school. Cars go way too fast and blast through intersections. Impeding the flow of car traffic is exactly what we need. I'd rather not require the ambulance in the first place.